Ken Tucker

Plant's new solo album is called Band of Joy. That's the name of a group he was in back in 1967, before Led Zeppelin, with drummer John Bonham. Rock critic Ken Tucker says that if the album title suggests nostalgia for older musical styles, there's nothing musty about the results.

Skaggs became a mainstream country music star in the 1980s, but in recent years, he's become more interested in performing in a traditional bluegrass style. Ken Tucker says the tracks on Skaggs' album Mosaic "don't just fit together -- they lock into place with a firmness."

Perry has released what is commonly considered the pop hit of the summer, a song called "California Gurls." Perry has a new album, Teenage Dream, which rock critic Ken Tucker says is just one part of what he calls "the Katy Perry art project."